| Summary: | 碩士 === 國立體育學院 === 運動科學研究所 === 86 === The purpose of this study was to investigate the effects of creatine supplementation on muscle strength and performance for weighlifters. During different training periods, maximal muscle strength of back squat, snatch, clean and jerk were measured respectively. The first stage was to evalute the effects of training load on blood lactic acid. There were six weightlifters as subjects. Each subject''s blood lactic acid was checked before and after training during whole week. The second stage was to evaluate the effects of creatine supplementation on body composition, biological parameters and maximal muscle strength.There were ten weightlifters as subjects. Each subject was asked to take 3g creatine monohydrate per kilogram body weight per day for six days. Urine creatinite, boby weight, fat free mass, maximal muscle strength of back squat, and bloob BUN, creatinine, GOT, GPT were measured to evaluate the functions of creatine supplement, The third stage was to evaluate the effects of creatine supplementation on performance for weightlifters. Twenty weightlifters were divided into two groups according to their body weights. The subjects were asked to take either creatine monohydrate or maltodextrin as placebo. Snatch, clean and jerk were measured before and after supplementation. The resalts showed that: (1) there was no significant change on blood lactic acid before and after training. (2) there was significantly increased in the maximal muscle strength of back squat (p< 0.5) after taking creatine. This effect can sustain for two weeks after cessation of taking creatine, and disappear one month later. Side effects were not found. (3) there was no significant difference in body weight and fat free mass before and after taking creatine. (4) there were significant increases in clean and jerk as well as total weight of weight lifting for the creatine supplementation group. On the contrary, there was no significant change on weigth lifting performance for placebo group.
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